European Journal of Mechanics A-Solids最新文献

{"title":"Mechanical properties, microstructure evolution, and strengthening mechanism of Al-Mg-Si alloy welded joints using double-sided friction stir welding","authors":"Yuanpeng Liu ,&nbsp;Meixin Ge ,&nbsp;Guang Zeng ,&nbsp;Kun Chen ,&nbsp;Shunxin Liu ,&nbsp;Wenjian Tang ,&nbsp;Longxin Zhu","doi":"10.1016/j.euromechsol.2025.105987","DOIUrl":"10.1016/j.euromechsol.2025.105987","url":null,"abstract":"<div><div>As the demand for lightweight materials grows, aluminum alloys are increasingly utilized across various industries. However, conventional fusion welding of medium-thick aluminum plates often results in defects. Friction stir welding (FSW), a solid-state joining process, effectively mitigates these issues. This study investigates double-sided FSW (DS-FSW) and single-sided FSW (SS-FSW) of 6061-T6 aluminum alloy through combined experiments and numerical simulations. The thermal cycles, stress distribution, material flow, microstructure evolution, and mechanical properties of the joints are systematically examined. Results demonstrate that DS-FSW joints exhibit a 31 % higher yield strength (228 MPa) compared to SS-FSW joints (174 MPa), along with superior tensile strength. However, both joint types show lower elongation than the base material, with DS-FSW slightly lower (4.43 %) than SS-FSW (4.87 %). Microhardness distribution is more heterogeneous in DS-FSW, with higher hardness in the heat-affected zone but lower in the nugget zone. Microstructural analysis reveals finer grains, higher dislocation density, and a greater proportion of high-angle grain boundaries in DS-FSW. The study innovatively proposes the hetero-deformation induced (HDI) strengthening mechanism in DS-FSW joints, offering valuable insights for optimizing welding processes for medium-thick aluminum plates in aerospace, automotive, and energy applications.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105987"},"PeriodicalIF":4.2,"publicationDate":"2025-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145749780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Oncogenic transformation of tubular epithelial ducts: How mechanics affects morphology","authors":"D. Ambrosi ,&nbsp;A. Favata ,&nbsp;R. Paroni ,&nbsp;G. Tomassetti","doi":"10.1016/j.euromechsol.2025.105984","DOIUrl":"10.1016/j.euromechsol.2025.105984","url":null,"abstract":"<div><div>We derive a continuum mechanical model to capture the morphological changes occurring at the pre-tumoral stage of epithelial tissues. The mathematical model, derived from first principles, accounts for the competition between the bulk elasticity of the epithelium and the surface tension of the apical and basal boundaries. The variation of the energy functional yields the Euler–Lagrange equations to be numerically integrated. The numerical results reproduce a variety of morphological shapes, from invagination to evagination, depending on the ratio between bulk and surface energy at variance of the length of the section. In particular, using parameters independently measured, we are able to reproduce experimental data reported for a ring partially made of transformed cells.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105984"},"PeriodicalIF":4.2,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size-dependent thermo-mechanical stability of flexomagnetic nano-plates with initial imperfections","authors":"Hamed Momeni-Khabisi ,&nbsp;Masoud Tahani","doi":"10.1016/j.euromechsol.2025.105983","DOIUrl":"10.1016/j.euromechsol.2025.105983","url":null,"abstract":"<div><div>This study presents a comprehensive thermo-mechanical stability analysis of an imperfect rectangular piezo-flexomagnetic nano-plate. The theoretical model simultaneously incorporates both piezomagnetic and direct flexomagnetic effects, enabling a more comprehensive representation of magneto-mechanical coupling phenomena at the nanoscale. To capture the size-dependent behavior inherent to such nano-structures, the strain-gradient theory is employed through the inclusion of a material length-scale parameter. The governing differential equations and corresponding boundary conditions are derived based on the von Kármán nonlinear strain–displacement relations, classical plate theory, and principle of minimum total potential energy. Closed-form analytical solutions are obtained for critical buckling and post-buckling behavior under mechanical, thermal, and coupled thermo-mechanical loading conditions for both roller and hinge edge supports. The analytical formulation is validated through comparisons with benchmark results reported in the literature. A parametric investigation is conducted to evaluate the effects of key parameters—including flexomagnetic coupling, aspect ratio, boundary conditions, initial geometric imperfection, and thermal loading—on the buckling and post-buckling response of the nano-plate. The numerical results reveal that the influence of the flexomagnetic effect is more pronounced under uniaxial in-plane loading compared to biaxial loading. Additionally, in biaxial loading conditions, the impact of the flexomagnetic property is significantly greater for aspect ratios less than unity. The stability performance of the nano-plate shows consistent improvement due to flexomagnetic effects for both uniaxial and biaxial loading scenarios. Size effects play a critical role in nanoscale structural behavior, as evidenced by the substantial increase in critical buckling load with the length-scale parameter. Geometric imperfections generally lower the critical load, though their impact on the post-buckling response varies with both imperfection magnitude and boundary constraints. Thermal loading demonstrates a more pronounced destabilizing effect compared to purely mechanical loading, particularly in plates with imperfections. Boundary conditions substantially influence the structural response: roller supports offer greater initial load capacity, whereas hinged supports develop enhanced membrane stiffening at larger deformation amplitudes. These findings offer valuable insights for the design and development of smart two-dimensional nano-devices where flexomagnetic coupling can be utilized for enhanced stability control.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105983"},"PeriodicalIF":4.2,"publicationDate":"2025-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Periodic mass infused rail pads towards enhanced vibration control","authors":"Indrajit Pahari,&nbsp;Arnab Banerjee,&nbsp;Bappaditya Manna","doi":"10.1016/j.euromechsol.2025.105975","DOIUrl":"10.1016/j.euromechsol.2025.105975","url":null,"abstract":"<div><div>Track-induced vibrations in railway systems pose challenges to infrastructure integrity and the surrounding environment, emphasizing the need for improved rail pad designs. This study introduces a novel periodic mass infused rail pad (PMIRP) and evaluates its vibration mitigation performance in comparison with conventional rail pads (CRP). Experimental investigations are carried out on a reduced-scale ballastless track using a servo-controlled hydraulic actuator to simulate train speeds ranging from 150 to 300<!--> <!-->km/h. A corresponding mathematical model is developed to predict the dynamic behavior of the PMIRP, and finite element models (FEM) are constructed to validate the response characteristics. Results show that the periodic steel masses embedded within the hollow cavities of the PMIRP act as dynamic resonators, effectively reducing acceleration levels by up to 32.67% across the tested speed range. Furthermore, the <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> optimization technique is employed to determine the optimal natural frequency ratio and resonator damping ratio. Overall, the PMIRP exhibits superior vibration attenuation compared to CRP, demonstrating strong potential for enhancing the performance of high-speed railway track systems.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105975"},"PeriodicalIF":4.2,"publicationDate":"2025-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A structural additive optimization method and its application in vibration reduction of helicopter rotor systems","authors":"Zhenyuan Zhang,&nbsp;Yujie Zhao,&nbsp;Honglin Li,&nbsp;Zhonghao Tang,&nbsp;Lei Li","doi":"10.1016/j.euromechsol.2025.105976","DOIUrl":"10.1016/j.euromechsol.2025.105976","url":null,"abstract":"<div><div>This study presents a structural additive optimization method designed to reduce vibrations in complex dynamic systems. Conventional optimization techniques, such as topology, shape, and sizing optimization, often encounter difficulties in addressing dynamic loading and manufacturing constraints. To address these challenges, the proposed method introduces targeted material addition at structural points with maximum dynamic displacement, thereby increasing stiffness and mitigating vibrations. The method's effectiveness is demonstrated through its application to a helicopter rotor system, which is characterized by intricate dynamic responses and operational complexities. Finite element modeling, transient dynamic analysis, and iterative optimization are employed to validate the approach. The results show a maximum displacement reduction of 41.01 %, indicating substantial improvements in structural stiffness and vibration suppression, while achieving this outcome with markedly lower computational cost compared to conventional size optimization methods. This research underscores the feasibility and adaptability of structural additive optimization under varying operational loads, offering a robust alternative to traditional methods. The findings have practical implications for vibration-sensitive engineering systems in which dynamic performance and structural integrity are paramount.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105976"},"PeriodicalIF":4.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dynamic analysis of a hub-FGM micro-beam based on meshless method in thermal environment","authors":"Du Chaofan ,&nbsp;Xu Ningning ,&nbsp;Li Liang ,&nbsp;Yu Chuanbin ,&nbsp;Zhang Dingguo","doi":"10.1016/j.euromechsol.2025.105971","DOIUrl":"10.1016/j.euromechsol.2025.105971","url":null,"abstract":"<div><div>This study investigates the dynamic characteristics of rotating functionally graded material (FGM) micro-beams operating in a thermal environment, incorporating size effects, A high-order coupled dynamic model is established based on the modified couple stress theory. The formulation explicitly accounts for axial shortening induced by lateral deformation (nonlinear coupling deformation term) and employs the point interpolation method (PIM) and radial point interpolation method (RPIM) to discretize the deformation field of flexible micro-beams. Lagrange's equation of the second kind provides the governing equations. The influences of critical parameters including temperature field, rotational velocity profiles, the FGM gradient index, and size dependence are quantitatively examined. The simulation results demonstrate that thermal environment and size effect exert significant, non-negligible in influences on the dynamic analysis of FGM micro-beams. Furthermore, this study confirms the efficacy of meshless methods specifically PIM and RPIM, highlighting their potential for extension to rigid-flexible-thermal coupled multi-body system dynamics.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105971"},"PeriodicalIF":4.2,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The isotropic relaxed micromorphic model in polar coordinates and its application to an elastostatic axisymmetric extension problem","authors":"Esmaeal Ghavanloo ,&nbsp;Patrizio Neff","doi":"10.1016/j.euromechsol.2025.105964","DOIUrl":"10.1016/j.euromechsol.2025.105964","url":null,"abstract":"<div><div>In this paper, we consider the isotropic relaxed micromorphic model in polar coordinates and use this representation to solve explicitly an elastostatic axisymmetric extension problem involving a linear system of ordinary differential equations. To obtain an analytical solution, modified Bessel functions are utilized and closed-form solutions for the displacement and micro-distortion are obtained. We show how certain limit cases (classical linear elasticity), which are naturally included in the relaxed micromorphic model, can be efficiently achieved. Furthermore, numerical results are calculated and the effects of various parameters are examined. The results can be used to calibrate and check corresponding finite element codes.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105964"},"PeriodicalIF":4.2,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145646041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of the sample shape factor on the dynamic characterization of viscoelastic properties: complex moduli and Poisson's ratio","authors":"Julen Cortazar-Noguerol,&nbsp;Fernando Cortés,&nbsp;María Jesús Elejabarrieta","doi":"10.1016/j.euromechsol.2025.105963","DOIUrl":"10.1016/j.euromechsol.2025.105963","url":null,"abstract":"<div><div>This study investigates how the sample shape factor influences the dynamic properties characterization of a silicone rubber within the linear viscoelastic regime. The effective elastic properties of elastomers are known to depend on geometry, but the effect of shape factor on the dynamic response has not been systematically characterized. To address this, cylindrical samples with varying geometries are tested under dynamic compression and torsion. The results reveal that both the complex compressive and shear moduli are affected by shape factor, and that this influence varies with frequency. To quantify the influence of shape factor and extract the material's dynamic properties, a phenomenological correction model is formulated. The model introduces frequency-dependent parameters that account for the geometric effects on the effective moduli. These corrected moduli yield a complex Poisson's ratio that exhibits a slight frequency dependence, with a decreasing real part and an increasing loss factor. This approach enables both the quantification of geometry-induced effects in dynamic mechanical testing and the extraction of intrinsic material's viscoelastic properties.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105963"},"PeriodicalIF":4.2,"publicationDate":"2025-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of axial preloading on the vibrational response of a double FG porous sandwich beam system surrounded by elastic medium","authors":"S. Shahab Ghafouri ,&nbsp;M. Soltani ,&nbsp;M.H. Momenian ,&nbsp;O. Civalek","doi":"10.1016/j.euromechsol.2025.105962","DOIUrl":"10.1016/j.euromechsol.2025.105962","url":null,"abstract":"<div><div>In this research, the free vibration behavior along with the stability analysis of two parallel three-layer sandwich beams made of porous materials and integrated with metallic face sheets inter-connected by a set of translational springs are assessed. The contemplated structure is placed on Winkler’s elastic foundation and subjected to an axial mechanical load. By considering the effects of shear deformation within the framework of Timoshenko beam model, and using the method of calculus of variations and Hamilton’s principle, the system of governing motion equations of the corresponding structure is obtained and analytically solved via Navier’s method and Fourier series functions for simply supported boundary conditions. The dispersion of internal pores is considered based on three different patterns through the thickness of the beam and its effect on the natural frequencies and endurable buckling loads of the under-investigation model is precisely investigated. Also, the impact of the changes in the porosity coefficient, aspect ratio, thickness ratio, and stiffness of elastic medium is comprehensively explored. Furthermore, the effect of tensile and/or compressive axial preloading on the natural frequencies of the contemplated double-bonded system is perused in detail. The obtained results indicate that changes in theses parameters have a remarkable influence on the stability and vibration performance of the system, and by considering appropriate design quantities, it is possible to attain the desired buckling capacity and vibrational characteristics, while minimizing the weight of the structure.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105962"},"PeriodicalIF":4.2,"publicationDate":"2025-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Vibration mitigation in piezoelectric sandwiched nanocomposite beam-like structures considering Bouc-Wen hysteresis: An adaptive fuzzy sliding mode control approach","authors":"Hadi Arvin ,&nbsp;Maryam Shahriari-kahkeshi ,&nbsp;Hossein Ghahhari ,&nbsp;Ömer Civalek","doi":"10.1016/j.euromechsol.2025.105961","DOIUrl":"10.1016/j.euromechsol.2025.105961","url":null,"abstract":"<div><div>In this study, an adaptive fuzzy sliding mode controller is proposed to mitigate the vibrations of a hysteretic sandwiched piezoelectric nanocomposite beam regarding system uncertainties, accounting for the intrinsic hysteresis behavior of the actuator layer. The core consists of a graphene sheet-reinforced composite, while the piezoelectric facesheets operate as both sensors and actuators. The actuator's hysteresis is modeled using a Bouc-Wen formulation with uncertain parameters. To compensate for this uncertain nonlinearity and suppress vibrations, an adaptive fuzzy sliding mode controller is developed, with stability guaranteed via Lyapunov's direct method. The results demonstrate the controller's high effectiveness in mitigating mechanical vibrations. The robustness of the proposed controller against parameter uncertainties allows it to manage small variations in structural stiffness and mass resulting from changes in the distribution pattern of the nanocomposite and the piezoelectric thickness ratio. As a result, the controlled deflection of the nanocomposite beam remains unaffected by these two parameters. The most important parameter affecting the controlled response is the type of boundary condition. Decreasing the piezoelectric layer thickness enhances the controller's effort. Due to the hysteresis behavior of the actuator, a steady-state controller effort remains in the system, which is more pronounced for the clamped-clamped nanocomposite beam. The corresponding hysteretic loop shows a similar observation for this boundary condition.</div></div>","PeriodicalId":50483,"journal":{"name":"European Journal of Mechanics A-Solids","volume":"117 ","pages":"Article 105961"},"PeriodicalIF":4.2,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}